Diodes AL8806 - Manual

AL8806
Document number: DS35144 Rev. 5 - 2
1 of 15
www.diodes.com
July 2013
© Diodes Incorporated
AL8806
HIGH EFFICIENCY 36V 1.5A BUCK LED DRIVER
Description
The AL8806 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 8 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 6V to 36V. The AL8806 switches at frequencies up
to 1MHz. This allows the use of small size external components,
hence minimizing the PCB area needed.
Maximum output current of AL8806 is set via an external resistor
connected between the V
IN
and SET input pins. Dimming is achieved
by applying either a DC voltage or a PWM signal at the CTRL input
pin. An input voltage of 0.4V or lower at CTRL switches off the output
MOSFET simplifying PWM dimming.
Features
 LED driving current up to 1.5A
 Better than 5% accuracy

High efficiency up to 98%

Operating input voltage from 6V to 36V
 High switching frequency up to 1MHz

PWM/DC input for dimming control

Built-in output open-circuit protection
 MSOP-8EP: Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
1
2
3
4
8
7
6
5
AL8806
SET
GND
GND
CTRL
V
IN
N/C
SW
SW
1
2
3
4
8
7
6
5
AL8806
SET
GND
GND
CTRL
V
IN
N/C
SW
SW
MSOP-8EP
Applications

High Power MR16 Lamps
 General Illumination Lamps
 Multi-Die LED Driver
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
AL8806
V
IN
SET
CTRL SW GND
C2
1µF
R
SET
0R089
C1
450µF
D1
D2 D3
D4 D5
~
12V
AC
33µH L1
Multi-
die
LED
DFLS230LH
DFLS230LH
x4